Take a Kadai and add oil. Once the oil becomes hot add in mustard and cumin seeds.Once it splutters add in Curry leaves.
Now add in the chopped onion and fry till it becomes golden brown
Now add in the ginger garlic paste and fry till the raw smell leaves. Keep the stove in medium flame otherwise, the ginger garlic paste might get burnt.
Now add the tomato puree. Add in the Chilli powder and coriander powder.
Add in the required salt.Now add the cooked green peas and chopped capsicum.
Saute it well for about 1 min.9) Now add in ½ cup water. Now cook in high flame for about 3-5 mins or till the water gets evaporated. Adjust this according to your taste. You can leave it as a gravy or dry completely.
Meanwhile chopped the reserved idlis as cubes. And deep fry in hot oil till it becomes crisp.
Now add the fried idlis in the cooked masala.
Fry for about 2 mins and garnish with coriander leaves.